I've been using superglue to stick capacitor on the 2303 chip ; after that it was easy to place capacitor leg on pin DTR and just heat with the welding iron. (i had put solder on capacitor leg before this step).

I didn't think it was possible to hack CMS component before that.

Now with this 2303 USB FTDI, it's possible to auto reset ATMEGA while uploading.

For testing FTDI 2303 installation and drivers, a very simple way is to put a jumper on TX/RX pin and to open a terminal : every information you send on rx will be forwarded to tx, and will echo in terminal, if anything goes right.

Second thing : i have been making a breduino, using his own power supply.

After testing, you have to connect GND from FTDI GND to ATMEGA GND, or sketch will not upload.